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Subject: Re: [OMPI users] excluding hosts
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-04-06 18:29:30

Hi David

Are you using a scheduler of some kind? If so, you can add this to your default mca param file:

orte_allocation_required = 1

This will prevent anyone running without having an allocation. You can also set

rmaps_base_no_schedule_local = 1

which tells mpirun not to schedule any MPI procs on the local node.

Does that solve the problem?

On Apr 6, 2010, at 3:28 PM, David Turner wrote:

> Hi,
> Our cluster has a handful of login nodes, and then a bunch of
> compute nodes. OpenMPI is installed in a global file system
> visible from both sets of nodes. This means users can type
> "mpirun" from an interactive prompt, and quickly oversubscribe
> the login node.
> So, is there a way to explicitly exclude hosts from consideration
> for mpirun? To prevent (what is usually accidental) running
> MPI apps on our login nodes? Thanks!
> --
> Best regards,
> David Turner
> User Services Group email: dpturner_at_[hidden]
> NERSC Division phone: (510) 486-4027
> Lawrence Berkeley Lab fax: (510) 486-4316
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